Think Pennsylvania's newest Democrat pulled off history's biggest about-face? These oft-forgotten changes of heart, by personalities ranging from porn star to Greek warrior, were even more jarring.

Bill Belichick: The Be-Hoodied Flip-Flopper

Bill Belichick: The Be-Hoodied Flip-Flopper

The New York Jets alternate between chaos (see: Favre, Brett, 2008-2009) and just plain sucking. But in 1999 they seemed fit for a Super Bowl run, with Bill Parcells stepping down to make room for Bill Belichick. The next day, Belichick readily injected a dose of bedlam with a quickly scribbled yet utterly touching resignation note (what heart wouldn't melt from the eloquence of "I resign as HC of the NYJ"?). One surreal press conference and a flight to Boston later, "Belicheat" was on his way to carrying the rival New England Patriots toward three titles — and providing one more reason why the Jets are the NFL's answer to the L.A. Clippers.

Linda Lovelace: In Too Deep

Linda Lovelace: In Too Deep

She starred in Deep Throat, offering American couples an excuse to watch pornography openly (and American mobsters an exciting new way to earn boatloads of cash). The former Linda Susan Boreman initially reveled in the attention, even starring in the non-porn Linda Lovelace for President, which let the world appreciate her acting talents without all that distracting fellatio. Then she revealed that her ex-husband had forced her to make Deep Throat and became the face of the anti-porn movement. Lovelace would later back away from that crowd, too, and before her death settled between the extremes (posing for fetish mag Leg Show, natch).